qpool: Disable search bar when managing questions and tags
Remove proposed_by and removed_by attribute filling in question pool forms and views
Beautify add question form
qpool: Dynamically add/remove answers when adding a new question
qpool: Update interface for editing questions

Make interface similar to interface for adding questions. It is possible
to dynamically add or remove answers. All other fields are not editable.

Bad thing is that, in order to keep it safe, all answers are deleted
from the database and then resubmitted. This may cause some overhead
when editing a question even if not actually editing answers.

Scheduling a question is not enabled, at this point.